The AD8232 is advertised as a single lead solution. What does it mean?

Q

The AD8232 is advertised as a single lead solution. What does it mean? Is this a two, three, or more electrodes solution?

A

The AD8232 is a single lead solution since it amplifies and filters the differential signal of two electrodes (a single pair). A one lead solution requires two (sense) electrodes as a minimum but a third electrode could also be used as an active (drive) electrode to reduce the common mode interferences.

In summary, the AD8232 is compulsory as a single lead solution implementable with two or optionally three electrodes.

Nothing stops you from using several AD8232s to build a multi-lead system for ECG, EOG or EMG. You would need to be careful and average the RLD (right leg drive) injected back to the body.